Hi I got a 2004 Ford F-350 with the 5.4 motor. The truck has 14,000 miles so I don't drive the truck too much I pretty much use it for moving equipment around on job sites. The manual calls for 5W20. I change the oil once a year with Motorcraft 5W20 and Motorcraft filter sometime twice a year cause I only drive about 2500 miles a year but it's hard miles cause I've hit the scale weighing 30,000 pounds a few times when I'm towing my equipment. I live a little south of Chicago so the weather ranges from 0F - 90F and I go Orlando in the winter with the truck for work trips and drive it 50%/50% city and highway. So I was thinking about use 5W30 or maybe Rotella T6 5W40 cause all of the weight I tow with this truck. So should I stick with the 5W20 or should I use a little ticker oil? thanks
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